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World Engines were built millenia ago, when Krypton sought to expand across space, they were tethered to the thousands of scout ships they sent as part of a massive terraforming project.

After Krypton was destroyed, General Zod and his small band of survivors from the Sword of Rao traveled for 3 decades through space, seeking ancient Kryptonian settlements, only to discover that all of them had withered. On Daxam, however, General Zod successfully obtained a World Engine, and attached it to his huge Black Zero starship, before continuing on his journey through space.

After being defeated in battle by Kal-El, an enraged General Zod ordered for the World Engine to finally be released, in order to begin terraforming Earth into a new Krypton. Black Zero began to descend near Metropolis while the Engine was sent to the Indian Ocean, on the other side of the planet. The two started the terraforming process by working in tandem, discharging a colossal pulsating gravitational beam through Earth (intending to increase the planet's gravity to that of Krypton), with the Engine also bombarding Earth's atmosphere with particulates (intending to alter the planet's biosphere to favor only the unadapted Kryptonians).

Superman, furiously combating the Engine's defenses.

Superman, right under the gravity beam.

Kal-El (now nicknamed "Superman" by the people of Earth) swiftly flew to the Indian Ocean, and began attacking the World Engine as the calamitous process continued. The Engine's defenses fought back, however, in the form of many huge Liquid Geo tentacles. Kal-El, however, soon managed to break through them and fell under the Engine's gravity beam. Despite the Kryptonian fumes generated by the Engine weakening him, he managed to fly against the tremendous force of the huge gravity beam, with enough momentum to swiftly penetrate the Engine and destroy it, thereby ending the terraformation and single-handedly saving all life on Earth. Shortly thereafter, Kal-El flew back to Metropolis to help destroy Black Zero and stop Zod and his Sword of Rao loyalists once and for all.